<script setup>
import { onMounted, ref } from 'vue';
const num = ref(0);
onMounted(() => {
    num.value = num.value + 1;
});
</script>

<template>
    <slot></slot>
    <button @click="num++">click num</button>
    <div>num:{{ num }}</div>
</template>

<style scoped>
.greet {
    color: green;
}
</style>